Grin ding-machine



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110.428.204. Patented May 20, 1890.

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E. H. FENTON. A GRINDING MACHINE.

' No. 428,204. Patented May 20, 1890.

Wtnesses:

Tens co., PHwo-umu..msnmn1ou u o UNITED STATES PATEN'r OFFICE.

EPHRAIM FENTON, OF KANSAS CITY, MISSOURI.

GRINDING-MACHINE.

SPEGIFICATION formng part of Letters Patent No.`428,204, dated May 20, 1890.

Application filed December 16, 1889. Serial No. 333,916. (No model.)

T0 all whom, it Wmzy concern:

Be it known that l, EPHRAIM H. FENTON, a citizen of the United States, residing at Kansas City, in the county of J ackson and State of Missouri, have invented certain new and useful Improvements in Grinding-Nlachines; and I do hereby declare that the following is a full, clear, and exact description of the invention, snch as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, forming` a part of this specification.

The object of my invention is to communicate automatically from the driving-shaft a vibratory movement. to the table in line with the grinding-tool in grinding-machines and also regulate the vibrations of the table in such a manner that the distance traversed in said vibrations past the grinding-tool may be increased and diminished.

My invention further consists in the novel construction and combination of parts, which will first be fully described, and specifically pointed out in the claims.

In the drawings, Figure 1 is a view in perspective of my improved grinding-machine, taken from the side, which is provided with the pitman for operating the table, an end portion of which table is broken away to show the pivoted table-support. Fig. 2 is a side elevation of the table, showing its angle of movement in dotted lines. 3 is a view in perspective of the pitman for operating the table. Fig. 4 is a side view in detail of the adjustable crank on the shaft. Fig. 5 is an edge view of the adjustable portion of the crank, seen at right angles to its position in Fig. 4, showing the cranlc-wrist. o

Similar letters of reference indicate corresponding` parts in all the figures.

ln the construction of my improved machine A represents a fiat rectangular-shaped bed. Upon the bed A in the direction of one end is secured fixedly the lower end portion of a standard B, the .other end of which is forked at b b. Through the forked ends b b in a horizontal direction are made the perforations b' b', and through said perforations is introduced one end portion of a driving-shaft c, which is screw-threaded a short distance at c'. Upon thev other end portion of shaft c is inounted an external annnlar cog-wheel O, Which is made of the proper dimensions to constitute the tool-driving wheel, andis placed close in position to and at one side of the standard B. Upon the wheel C is secured a handle cx.

A tool-can'rying` frame D is constructed, which consists of two parallel arms d d' of a suitable length, Which are connected rigidly by transverse bars CZ2 (7,2, which are arranged between the opposite ends of said frame. The opposite portions or arms d d' at one end of the frame D are made to fit against the respective outer side portions of the forked ends b b of standard B, and are perforated in a transverse direction at 013 to receive and vibrate freely upon the shaft c, Which extends through said arms. The frame D extends from the shaft o radially a short distance beyond the periphery of the driving-wheel C. On the side-of the contig'uous portion of the wheel C to the arm d' of frame D, and at-.

tached rigidly to the hub of said Wheel C, is a sleeve C2, which extends to the side of arm d, and upon the screw-threaded end of the shaft c is fitted a nut 63, Which nut and sleeve prevent any lateral movement .of the Wheel O. Through the sleeve C2 and the shaft c is made n a transverse direction a registering perforation C4, through Which perforation is inserted a pin or key 05. In the other end of frame D and the arms d d' than those connected With the shaft c are attached the journal-boxes (14 dt, and journaled in a horizontal position in said journal-boxes is a mandrel E, one end of which mandrel extendsto a point beyond the inner side of and in line with the periphery of said Wheel C, and upon said end of the inandrel, opposte to and meshing' with the cogs on said Wheel O, is keyed a gear e. Upon the mandrel E, between the parallel arms fl d' of frame D, is fitted rigidly, so as to turn therewith, a grinding-disk F, composed of emery or other suitable grinding material, which said disk corresponds in shape to two truncated cones joined at their bases and adapted more particularly for sharpening` mower and reaper knives. The form of the tool, however, may be changed to accommodate the conformation of the tool to be ground. To receive the extended disk F betWeen the vibratingend portions of the frame IOO D a portion of ihe said arm d' is bent in a curved line of direction and extended laterally from the arm d the required distance.

To the extreme vibrating end portion of the frame D, a short distance from the journal-boxes (14, and extending in a curved direction from arm d to arm d', is attached rigidly a brace-bar d, and extending laterally from the brace-bar beyond the line of the said vibrating end portion of said frame D is a handle d.

Upon the other end portion of the bed A from that -having standard B, and which is in front of the grinding-disk F, is mounted a vibrating table G, parallel With the shaft c. To support the table G an adjustable plate g of narrow width is extended in a horizontal direction across the said bed A, at either end of which plate are attached the lugs g' g' ,6/2 92. In a transverse direction through plate g, in line with and near the sides of lugs g' g2, which are directly opposite each other, are made the slots g3 93. Through the bed A are inserted the bolts g4 94, one end'of each of which extends in avertical direction through the slots '(13 93, and are sereW-threaded and provided With the nuts 95 95. Between the lugs g' g' g2 g2 is pivoted the lower end portion of the single legs or supports gG g, and to the upper end portion of said supports is attached rigidly the vibrating table G. In the central and side portion of the table G, opposite to and in line With the disk F, is made a V-shaped opening gx, corresponding to that between the separate teeth in the knives of a mower or reaper. Extending a short distance from each end of table E in a horizontal direction, and from the side other than that provided with the V-shaped s1ot,are the supports g7 gl, and upon the outer end portion of v each support are pivoted double-armed levers gS gs, which are arranged in position a short distance above and extend over the top portion of the table G, so as to pass in a circuit overI and hold the knives in position upon said table, the rigidly-connected arms gi) gi) of which levers extend in an opposite direction and are elevated in .position above the line of said levers.

To the upper end portion of the vibrating legs gfi of the table G, Which is on the other side of the machine from that having wheel O, and on the side toward the grinding-disk F, is attached the lower end portion of an arm H, which extends in an upward curved direction over the side and to a point above table G in a vertical line with the said leg gs. The upper end portion of the arm H is made flat at h and perforated in a transverse direction. A portion 06 of the shaft c on thel standard B, between the nut 03 and the arm d' of frame D, is extended in length and made square in form. (See Figs. 4 and 5.) A crank I is then made, one portion t' of Which is made flat of a suitable length, and through said plate is made a longitudinal slot 11', Which is of a suficient Width to fit over the square portion cG of shaft c and slide thereon. The other portion t2 of the crank is made circular in form, and a short distance from the portion t' of the crank, from which it extends at right angles, the outer end of said portion t2 is reduced in diameter to form a wrist t3. The slotted portion 'L' of the crank is then fitted over the square portion of the shaftc and the nut 03 turned on said shaft against the said portion fi of the crank, so as to hold the crank adjust-ably in position.

To the upper end portion of the arm H are connected the forked ends 7a 7a of a lever-arm or pitman K, which is perforated at 79,. so as t0 register with the transverse perforation in the portion h of the arm H, and through said perforation is inserted a split pin or key kz. The other end of the pitman K extends to the wrist t3 of crank I and is perforated at 7:1 in a transverse direction, so as to fit 'over and turn freely on said wrist.

Between the erank I and the arm H the pitman K is bent laterally at an angle, so as to form a double curvo, and thus be removed from the path of the grin'ding-tool. Through the wrist 't2 is made outside of the pitman If a transverse perforation, through which is mserted a split pin or key In the operation of my improved machine the tool-frame D is held by the hand above the plane of the table, and the mower-knives laid horizontally upon the table in such aposition as to bring the eontiguous portions of adjacent teeth in line with the V-shaped opening G. The levers gs are then swiveled in position by means of the arms g, so as to rest upon the knives upon the table and 'pre- Vent an upward recoil movement. The grinding tool or wheel F is then placed upon the teeth of the mower-knives. The wheel C is then rotated by means of the handle cx, and an aceelerated movement communicated to the gear e and also to the grinding-tool. In the same movement of the wheel O the crank I upon shaft c turns therewith, and the movement is communicated by the pitman K to the table, Which is vibrated to and fro beneath the grinding-tool and theknives thereon immediately in the path of the said tool. In this manner the entire length of the teeth upon a Cutter-bar of a mower or reaper is ground uniformly, and the change of position of the grinding-tool accomplished automatically in the rotation of the driving-wheel. When it is desired to vibrate the table with rapidity, and thus present the length of surface A of the teeth more frequently to the action of the grinding-tool, the n ut 03 is turned, so as to permit the adj ustment of the slotted plate t, and the portion t2 of said crank broughtnearer in position to the end of shaft o, thus reducing the length and circuit of rotation of the crank. W'hen plate i is adjusted in an opposite direction, so as to increase the distance between the portion t2 of the crank and the end of shaft c, the vibrations of the table are slower, though the speed of the IIO d rivin g-Wheel may be increased and the an gle of the table adapted to knives varying in length as well as enabling the grinding to be accomplished more gradually and in sloWer degrees the entire length of the teeth of the knives. lVhen it is desired to adjust the position of table G farth er beneath the grinding-tool, the nuts g5 on the bolts (4, which hold the plate g upon the bed A, are released and the said plate pushed forward in the direction of the standard B, thereby changing the position of the legs g6 in relation to the fixed position of the `grinding-tool when in rotation, and thereby and in connection with the adjustinent of the pitman connected with the table enable the griuding to be contined to a short portion ot' the teeth of the mower-knives and the teeth vibrated at the same time with rapidity, so that various forms of knives are adapted to be sharpened, according to their peculiar shape and degree of hardness of the material of which they consist.

Having fully described my invention, What I now claim as new, and desire to secure by Letters Patent, is-

1. In a grinding-machine having a drivingshaft at one end of said machine and a vibrating table having vibrating standards at the other, the combination, with said shaft and table, of a pitman, and a crank connected with said pitman and said shaft and adjustable in said shaft, and a support for said standards adj ustable in the line of direction of said pitman, substantially as and for the purpose described.

. 2. In a grinding-machine, the combination, With a suitable standard, of a driving-wheel having` a driving-shaft provided With a crank on said standard, a vibrating tool-holder or frame pivotally attached at one end to said standard and havinga rotating grinding-tool at its other end provided With suitable gearing connected With said driving-Wheel, a vibrating table beneath said grinding-tool, and a pitman connected with the crank on said shaft and said table, for the purpose described.

3. In a grinding-inachine, the combination, With a suitable standard, of a driving-wheel having a driving-shaft, a vibratin g tool-holder or frame pivotally attached at one end to said standard and having a rotary grind ing-tool at its other end provided with suitable gearing connected with saiddriving-Wheel, a Vibrating table beneath said grinding-tool, a pitman connected at one end With said table and a* crank connected with the other end of said pitman and adjustably connected With said driving-shaft, su bstantially asand for the purpose described.

4. In a grinding-machine, the combination, with a suitable standard at one end of said machine, of a driving-wheel having a drivingshaft provided With a crank, a tool-supporting table at the other end of said machine, a pitman connected With said table and said crank, a Vibrating tool-holder or frame pivotally attached at one end to said standard and having a rotary grinding-tool atits other end and provided with suitable gearing connected With said driving-Wheel, and supports for said Vibrating table adj ustable in the direction of said standard, for the purpose (lescribed.

EPHRAIM H. FENTON.

Witnesses:

S. L. O. HAssoN, F. G. FISCHER. 

